Sock



FIG. 1 is a side elevational view of a sock showing our new design, the opposite side being a mirror image;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a top plan view; and

FIG. 5 is a bottom plan view. 

The ornamental design for a sock, as shown and described. 